Refs #9710. Fix unit label.

Manually overwrite our own label at the end of the reduction.

Fix PolotAxis so that if the YUnitLabel of an axis has been set, then that
should be displayed in plots instead of any other unit settings.

Code/Mantid/MantidQt/API/src/PlotAxis.cpp

@@ -90,6 +90,12 @@ namespace MantidQt
      */
     void PlotAxis::titleFromYData(const Mantid::API::MatrixWorkspace &workspace)
     {
+      if( !workspace.YUnitLabel().empty() )
+      {
+        m_title = QString::fromStdString(workspace.YUnitLabel());
+        return;
+      }
+
       m_title = QString::fromStdString(workspace.YUnit());
       if(workspace.isDistribution() && workspace.axes() > 0 && workspace.getAxis(0)->unit())
       {

Code/Mantid/scripts/SANS/ISISCommandInterface.py

@@ -536,6 +536,8 @@ def WavRangeReduction(wav_start=None, wav_end=None, full_trans_wav=None, name_su
 
     if resetSetup:
         _refresh_singleton()
+
+    mtd[retWSname].setYUnitLabel("I(q) (cm-1)")
     
     return retWSname